結構1.肯定形式① be動詞was / were …

② 行為動詞動詞的過去式(動詞過去式分規(guī)則變化與不規(guī)則變化)如 He was a teacher 3 years ago.

Jenny visited Shanghai last month. I went to school at 6:30 yesterday.

規(guī)則動詞的過去式的構成遵循以下四個規(guī)則∶

a.直接在動詞后加ed，例如help-helpedwant-wanted等

b.以不發(fā)音的字母e結尾時，去掉e加ed(即直接加d)，例如like-liked;use-used等

c. 以輔音字母y結尾時，把y變成i再加ed，例如carry-carried; study-studied等;

d.以重讀閉音節(jié)結尾，雙寫最后一個輔音字母再加ed，例如∶stop-stopped;shop-shopped等。不規(guī)則動詞的過去式則需要特殊記，例如go-wentcome-came;buy-bought等。

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